Electronic lock with bolt There are 2 elements, the fixed part painted black and the metal hook. You have to slam the door to close it and put 12v on the wires to unlock. electromagnetic lock is mainly acarbon steel material, the lock hook can bear 150kg pull.<br><br>Precautions when plugging in The lock should not be powered for more than 3 seconds, and the voltage should be 12V 2A. If you use a relay with a digital code and when you unlock, everything turns off. Because food is notnot powerful enough, you have to power the coil separately or put in a dedicated power supply for the lock.<br><br>Open via intercom The lock can be opened via intercom with a little DIY. You just need to send a 12v and 2 amp pulse, so provide a small relay in the event of a lack of power with a 12v 3 amp power supply. Perfectto secure the cupboards, so that children cannot access.<br><br>Energy saving and long life Shockproof, anti-puncture and anti-theft protection. Mechanical life, when designing the load condition, about 500,000 times. Suitable for a door weighing 0.5 to 4 kg.<br><br>Easy to use Electro-magnet magnetic lock for easy installation, without limits on the left, right, front, rear side and which allows the mechanical unlocking position of the tabs. Built-in unlock status detection. Sizeapprox. 5.7 x 7.2 x 1.4 cm. Application for delivery cabinets, refrigerated cabinet, mailbox or newspapers, self-service cabinet, counter.